Chair mat



FIG. 1 is a front perspective view of a chair mat showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a partial enlarged view of the indicated area “6” in FIG. 5;and,

FIG. 7 is a rear perspective view thereof.

The dot-dash broken lines indicating an enlargement portion of thedesign form no part of the claimed design.

A bottom view is omitted since the bottom view is a mirror image of thetop view.

A right side view is omitted since the right side view is a mirror imageof the left side view.

CLAIM The ornamental design for a chair mat, as shown and described.